JPH1125463A - Optical disk, optical disk recording/reproducing device and data recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk for increasing the storage capacity of a read-only area, and an optical disk recording/reproducing device and a data recording method wherein the reading and writing performance of the optical disk recording/reproducing device is fully exercised. SOLUTION: An optical disk 1 has a ROM area 2 and a RAM area 3 formed in its inner peripheral part. In the ROM area 2, information is recorded beforehand at a high density by a pit smaller than a pit specified by a CD format and, in the RAM area 3, a land and a groove are formed for forming a pit by a succeeding follow-up type perforating system and recording information in a CD format. An optical disk recording/reproducing device is provided for irradiating the optical disk 1 with an optical beams used for both recording and reproducing to form a pit in the RAM area 3 and reading the pit recorded at the high density in the ROM area 2 to perform signal reproducing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk, an optical disk recording / reproducing apparatus and a data recording method, and more particularly, to an optical disk having a read-only area on an inner periphery and a data write area on the outer periphery. The present invention relates to an optical disk recording / reproducing apparatus for recording and reproducing information using the optical disk and a data recording method for recording data on the optical disk.

[0002]

2. Description of the Related Art Conventionally, as an optical disk of this type, C
D (compact disc), a read-only area in which information is recorded with or without a concave pit on the inner periphery;
An optical disk having a write-once or magneto-optical type data write area on the outer periphery of a read-only area like a (recordable disk), and information recording and reproduction using this conventional optical disk An optical disk recording / reproducing apparatus for performing the above is well known.

Further, in the conventional optical disc, physical formats such as outer shape, dimensional range of read-only area and data write area, storage capacity and pit shape are specified. In optical discs, optically readable information is recorded in a CD format, and in a data writing area, there is an optical disc in which information is recorded in a CD format by forming pits by a write-once type punching method. In the optical disk, the pit shapes of the read-only area and the data write area are concave and have almost the same shape.

In the above-described optical disk recording / reproducing apparatus, when pits are formed in a data writing area by a piercing method, it is necessary to consider that the pit shape is larger than the beam diameter to be irradiated. By irradiating a writing beam having a smaller beam diameter than the shape, pits conforming to the CD format are formed. Further, this optical disk recording / reproducing apparatus generally reproduces information by optically reading out the presence or absence of pits recorded in a read-only area and a data write area using a write beam as it is.

[0005]

That is, in a conventional optical disk recording / reproducing apparatus, a reading beam having a beam diameter much smaller than a beam diameter required for reproducing information recorded in a CD format is emitted. When information is reproduced and attention is paid to information reproduction, this is an over-specification, and it cannot be said that the performance of the optical disk recording / reproducing apparatus, particularly the reading performance, is sufficiently exhibited.

Further, in order to record more information in a read-only area of a conventional optical disk and to manufacture an optical disk recording / reproducing apparatus at low cost, a signal processing LSI or pickup developed by an existing CD reproducing apparatus is used. There is also a request to use it as it is. The present invention has been made in order to solve the above problems, and has an optical disk for increasing the storage capacity of a read-only area of an optical disk, and fully exhibits the read and write performance of an optical disk recording / reproducing apparatus. It is an object of the present invention to provide an optical disk recording / reproducing apparatus and a data recording method for causing the optical disk to be recorded.

[0007]

According to a first aspect of the present invention, there is provided an optical disk for achieving the above object, wherein an inner peripheral portion of the optical disk has a read-only area in which data is written. And an outer peripheral portion of the read-only area constitutes a data write area in which data can be written, and the data write area has a lower density than a recording density of data written in the read-only area. And data writing is possible.

According to a second aspect of the present invention, there is provided an optical disk, wherein an inner peripheral portion of the optical disk has a read-only area in which data is written, and an outer peripheral portion of the read-only region has a data write portion. A possible data write area is formed, and data written in the read-only area is recorded at a high density by pits smaller than pits specified by the CD standard and in a CD signal format. Features.

According to a third aspect of the present invention, there is provided an optical disk recording / reproducing apparatus according to the present invention, wherein a read-only area in which data is written in an inner peripheral portion, and a data write area in which data is written outside the inner peripheral portion. An optical disk recording / reproducing apparatus for recording and reproducing data using an optical disk, comprising: a light beam irradiating means for irradiating the optical disk with a light beam; And recording data in a read-only area of the optical disk.

According to a fourth aspect of the present invention, there is provided a data recording method according to the present invention, wherein a read-only area in which data is written in an inner peripheral portion and a data write area in which data is written in an outer peripheral portion of the read-only area are formed. A data recording method for recording data on an optical disk, comprising: using a single light beam for optically reading data recorded in the read-only area, using a light beam having a recording density of data recorded in the read-only area. Data is recorded in the data writing area at a low density.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the following terms are defined for convenience of explanation. (1) In the case of an optical disc having a constant linear velocity, the "recording density" refers to the density of data recorded in a fixed length range of a track arc on which data is written, and an optical disc having a constant angular velocity. In the case of, the density of the data recorded in a certain angle range of the track on which the data is written.

(2) "The recording density is high" means that the density of data recorded in the certain range is higher than the density of data recorded in the certain range to be compared, Is recorded. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition,
In the drawings, the same or corresponding parts have the same reference characters allotted, and description thereof will not be repeated.

FIG. 1 is a plan view showing the structure of an optical disk according to the present invention. Reference numeral 1 denotes an optical disk, which has a center hole 5 for attachment at the center, a read-only area (hereinafter, referred to as a "ROM area") 2 and a data write area (hereinafter, referred to as a "RAM area") 3 at an inner periphery. Are formed. In the ROM area 2, data is previously recorded at a high density in pits smaller than the pits specified in the CD format, and in the RAM area 3, data is formed by forming pits later by a write-once type punching method. Lands and grooves for recording in the CD format are formed.

In this embodiment, a case where the RAM area 3 is of the write-once type will be described as an example. However, the present invention can also be applied to an optical disk in which the RAM area 3 is recorded and reproduced by a magneto-optical method or a phase change method. It is. FIG. 2 is a plan view showing the structure of pits recorded on the optical disc according to the present invention.

Reference numeral 2a denotes a minimum pit recorded in the ROM area of the optical disc, which is recorded at a high density and in a CD signal format by pits smaller than the pits specified by the CD standard. 3a is the R of the optical disc.
This is the minimum pit recorded in the AM area, which has substantially the same size as the pit defined by the CD standard, and is recorded in the CD signal format.

As is apparent from the drawing, the diameter of the minimum pit 2a is about 2/3 times larger than the diameter of the minimum pit 3a, and its track pitch is also about 2 /
As a result, the recording density of information recorded in the ROM area is about 2 times that of the RAM area.
The density is about twice as high. FIG. 3 shows a light beam irradiated by the optical disk recording / reproducing apparatus according to the present invention and the RO of the optical disk.
FIG. 3 is a conceptual diagram showing a relationship between pits recorded in an M area and a RAM area.

FIG. 3A shows a relationship between a light beam applied to an optical disk and pits recorded in a ROM area. Reference numeral 4 denotes a light beam for reading and writing information recorded on the optical disk 1, which is substantially the same or smaller than the pit 2a.
The information can be read by sufficiently determining the presence or absence of a.

FIG. 3B shows the relationship between the light beam applied to the optical disk and the pits recorded in the RAM area. When the light beam 4 is irradiated on the optical disc 1,
Since the temperature up to the peripheral portion 4a rises to a temperature sufficient for pit formation, pits 3a having a diameter larger than the diameter of the light beam 4 are recorded in the RAM area.

Therefore, the optical disk recording / reproducing apparatus according to the present invention uses one light beam for optically reading data recorded in the ROM area 2 to reduce the recording density of the data recorded in the ROM area 2. Low density, RAM area 3
The data recording method is used to record data in the data. FIG. 4 is a block diagram showing a configuration of a signal recording system of the optical disc recording / reproducing apparatus according to the present invention.

The signal recording system of this optical disk recording / reproducing apparatus stores a CLV (Constant Linear Vegetable) in the RAM area 3 of the optical disk 1 according to the CD format.
The pits are formed by a locality method. 101 is a system control unit including a CPU (Central Processing Unit),
It controls the entire optical disk recording / reproducing apparatus.

An optical head 102 irradiates the optical disk 1 with a laser beam for recording and reading information. A servo circuit 103 performs focus and tracking servo of an actuator included in the optical head 102 and thread servo of a feed motor that moves the entire optical head 102 in the tracking direction of the optical disc 1.

Reference numeral 104 denotes a position detection unit which detects a position of the optical head 102 relative to the optical disc 1. The position detection unit 104 calculates and detects the relative position of the optical head 102 based on a position signal output from a position detector such as a linear scale, and also detects a track recorded on the optical disc 1. The relative position of the optical head 102 is detected by counting the number.

A spindle motor 105 rotates the optical disk 1 at a constant linear velocity. Particularly, in order to rotate the optical disc 1 at a constant linear velocity in a recording mode described later, the optical disc 1 is provided with an encoder for detecting the number of revolutions. Reference numeral 106 denotes a CLV calculation unit, and the position detection unit 10
The rotation speed of the spindle motor 105 is calculated based on the relative position of the optical head 102 with respect to the optical disk 1 detected by 4.

Reference numeral 107 denotes a spindle servo circuit.
The spindle motor 10 is controlled so that the rotation speed is calculated by the system control unit 101 or the CLV calculation unit 106.
5 is controlled. Next, an operation of the optical disk recording / reproducing apparatus according to the present invention configured as described above for recording a signal will be described.

When the system control unit 101 enters the recording mode and receives the recording data, it issues a command to the servo circuit 103 and the spindle servo circuit 107 to send the optical head 102 and the spindle motor 105 to the optical head 10.
After the necessary information is read by applying a predetermined servo by a control signal generated based on the read signal from the optical disk 2, the light beam 4 is recorded on the recording track of the RAM area 3 of the optical disk 1.
The optical head 102 is moved so that is irradiated.

When the position detector 104 detects the relative position of the optical head 102 with respect to the optical disk 1 and outputs the result, the CLV calculator 106 calculates and outputs the rotational speed of the spindle motor 105. Then, the spindle servo circuit 107 applies CLV servo to the spindle motor 105 based on the output signal of the CLV calculator 106 so that the optical disc 1 rotates at a predetermined linear velocity.

Next, the system control unit 101 modulates the recording data in accordance with the EFM system, which is a CD signal format, and creates a recording signal so that the modulated data signal is formed as pits on the optical disc 1. Output to the optical head 102. Upon receiving the recording signal, the optical head 102 modulates the light beam 4 in accordance with the recording signal and irradiates the optical beam 1 onto the optical disk 1 to form a pit.

FIG. 5 is a block diagram showing the configuration of the signal reproducing system of the optical disk recording / reproducing apparatus according to the present invention. The signal reproducing system of this optical disk recording / reproducing apparatus reads the pits formed on the optical disk 1 by the CLV method according to the CD format except for the pit shape and the recording density, and reproduces the signal. Hereinafter, a signal reproducing operation of the optical disk recording / reproducing apparatus according to the present invention will be described.

When the system control unit 101 enters the reproduction mode, the servo circuit 103 and the spindle servo circuit 10
7 to the optical head 102 and the spindle motor 105 according to a control signal generated based on the read signal from the optical head 102, to perform predetermined servo on the optical disc 1 and read necessary information. The read data is output to a digital signal processing unit (not shown).

However, when reading the information, the system control unit 101 reads the ROM area 2 and the RAM
By properly switching the constants of various servo systems in the area 3, the signal is reproduced in an optimum state.

[0031]

As described above, according to the optical disk of the present invention, the recording density of the read-only area of the optical disk is high, so that the physical shape is the same as that of the conventional optical disk. Nevertheless, the storage capacity can be increased. According to the optical disk recording / reproducing apparatus of the present invention, pits recorded at a high density in a read-only area are read out using a light beam that forms pits in a data write area of the optical disk. It is possible to sufficiently exhibit the read performance possessed.

Further, according to the data recording method of the present invention, the reading and writing performance of the optical disk recording / reproducing apparatus can be sufficiently exhibited.

[Brief description of the drawings]

FIG. 1 is a plan view showing the structure of an optical disc according to the present invention.

FIG. 2 is a plan view showing a structure of a pit recorded on an optical disc according to the present invention.

FIG. 3 is a conceptual diagram showing a relationship between a light beam and pits recorded on an optical disc.

FIG. 4 is a block diagram showing a configuration of a signal recording system of the optical disc recording / reproducing apparatus according to the present invention.

FIG. 5 is a block diagram showing a configuration of a signal reproducing system of the optical disk recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Read-only area 3 Data writing area 4 Light beam 5 Center hole 101 System control unit 102 Optical head 103 Servo circuit 104 Position detection unit 105 Spindle motor 106 CLV calculation unit 107 Spindle servo circuit

Claims (4)

[Claims] 1. An optical disc, wherein an inner peripheral portion of the optical disc comprises a read-only area in which data is written, and an outer peripheral portion of the read-only area comprises a data write area in which data can be written. An optical disc, wherein data can be written in the data write area at a lower density than the recording density of data written in the read-only area. 2. An optical disc, wherein an inner peripheral portion of the optical disc comprises a read-only area in which data is written, and an outer peripheral portion of the read-only area comprises a data write area in which data can be written. An optical disc characterized in that data written in the read-only area is recorded in pits smaller than pits specified by the CD standard at a high density and in a CD signal format. 3. An optical disc for recording and reproducing data using an optical disc having a read-only area in which data is written on an inner peripheral portion and a data write area in which data is written outside the inner peripheral portion. A recording / reproducing device, comprising: a light beam irradiating unit for irradiating the optical disk with a light beam; and recording data in a data writing area of the optical disk by one light beam irradiated from the light beam irradiating unit. Reading data recorded in a read-only area of the optical disk. 4. A data recording method for recording data on an optical disk having a read-only area in which data is written on an inner peripheral portion and a data write area in which data is written on an outer peripheral portion of the read-only area. And using one light beam for optically reading data recorded in the read-only area, using a light beam having a lower density than the recording density of the data recorded in the read-only area, Recording data, a data recording method.